Function
- Generate a table summarizing the structural adequacy for the flanges in beams with longitudinal stiffeners in the cross-section. The table contains two tabs to show the summary for the yielding of the flange plate and the strength of longitudinal flange stiffeners.
Call
From the main menu, select [Rating] tab > [Type : Steel Bridge] > [Assessment Code : CS454/20] > [Results] group > [Assessment Result Tables] > [Steel Flange Reserve Factor (Beams with L. Stiffeners)]
Input
1. Flange tab
Element : Element ID
Part : The i- or j-end of the element, giving the Node ID at that end in square brackets [Node ID]
Section Type : Compact or noncompact
Rating Case : The relevant Load Combinations for Assessment.
Comp./Tens. : The stress condition in flanges (Compression/Tension).
Sig_yf : The nominal yield stress for the flange material.
Sig_f_SV : The longitudinal stress at the mid-plane of the flange plate due to SV load model.
Tau_SV : The summation of the shear stress (Clause 9.10.2.1, BS5400:3) due to SV load model.
Sig_f_DL : The longitudinal stress at the mid-plane of the flange plate due to combined dead load and superimposed dead load.
Tau_DL : The summation of the shear stress (Clause 9.10.2.1, BS5400:3) due to combined dead load and superimposed dead load.
Sig_f_ST : The longitudinal stress at the mid-plane of the flange plate due to ALL Model 2 loading.
Tau_ST : The summation of the shear stress (Clause 9.10.2.1, BS5400:3) due to ALL Model 2 loading.
A : Structural Adequacy – calculated as the assessment resistance over the assessment load effects (RA*/SA*).
Psi : Reserve Factor against a special vehicle load model with the associated standard vehicle loading. The symbol hyphen (-) is shown when the shear directions are different between resistance and shear force due to special vehicle.
Psi* : Reserve Factor against a special vehicle load model without the associated standard vehicle loading. The symbol hyphen (-) is shown when the shear directions are different between resistance and shear force due to special vehicle.
Check : An overall indication whether the section passed all checks and is OK or Not Good (NG)
Structural adequacy (A), Psi, and Psi* are calculated as follows. The value of Sig_2 is assumed to be zero.
Psi x S* + SD* + SST* = RA*, Psi is determined with back-calculation from the equation.
Psi* x S* + SD* = RA*, Psi* is determined with back-calculation from the equation.
2. Stiffener tab
Element : Element ID
Part : The i- or j-end of the element, giving the Node ID at that end in square brackets [Node ID]
Rating Case : The relevant Load Combinations for Assessment.
Stiffener/Flange : Components for the assessment.
k_l : The value of the reduction factor.
Sig_y : The nominal yield stress for the stiffener material or the flange plate material.
Sig_a_SV : The longitudinal stress at the centroid of the effective section of the stiffener due to SV load model.
Tau_1_SV : The in-plane shear stress in the flange plate due to torsion of SV load model.
Sig_a_DL : The longitudinal stress at the centroid of the effective section of the stiffener due to combined dead load and superimposed dead load.
Tau_1_DL : The in-plane shear stress in the flange plate due to combined dead load and superimposed dead load.
Sig_a_ST : The longitudinal stress at the centroid of the effective section of the stiffener due to ALL Model 2 loading.
Tau_1_ST : The in-plane shear stress in the flange plate due to ALL Model 2 loading.
A : Structural Adequacy – calculated as the assessment resistance over the assessment load effects (RA*/SA*).
Psi : Reserve Factor against a special vehicle load model with the associated standard vehicle loading. The symbol hyphen (-) is shown when the shear directions are different between resistance and shear force due to special vehicle.
Psi* : Reserve Factor against a special vehicle load model without the associated standard vehicle loading. The symbol hyphen (-) is shown when the shear directions are different between resistance and shear force due to special vehicle.
Check : An overall indication whether the section passed all checks and is OK or Not Good (NG).
Structural adequacy (A), Psi, and Psi* are calculated as follows.
Psi x S* + SD* + SST* = RA*, Psi is determined with back-calculation from the equation.
Psi* x S* + SD* = RA*, Psi* is determined with back-calculation from the equation.